Posted by jdemaris on August 15, 2010 at 05:59:36 from (67.142.130.14):
I'm trying to find the safe-max load capacity for a GM rear from a 3/4 ton Suburban. Weight load is all I care about, not pulling capacity. Weight load is determined by the axles and wheel bearing, whereas pulling is determined by the size of the ring and pinion.
14 bolt, 9.5" ring gear, semi-floating, 8 lug.
The "max axle specs" posted on many truck door pillars don't do me any good. They take into account the sring package and are not just for the axle itself.
I do know this axle as a max torque allowed at the input (where the driveshaft hooks) of 2,100 foot lbs. The GM 10 bolt axle has a max input of 1500 foot lbs.
I don't care about the torque though, just want to know the weight-carrying capacity that is rated "safe" for constant use.
I've got a diesel 4WD mini-motorhome that weighs 7000 lbs. and at present has two 10 bolt axles under it with 235/75-15" tires. I am supposing the axles are at their max and maybe a little over? Been fine for two years now, but - I'm thinking of sticking in bigger axles with 16" tires. All depends on the gain.
I have a pair of axles I pulled out of an 89 GMC 3/4 ton diesel Suburban. Front is 10 bolt and rear is the 14 bolt I mentioned. As far as the front 10 bolt rear, I'm assuming it has bigger wheel bearings then it would if in a 1/2 ton rig - but I'll have to research it.
If I use this setup, I'm also getting much bigger brakes which will be nice to have.
Back in 1976, Chevroltet and GMC sold factory-authorized K5 Blazers and Jimmys with motorhome bodies installed - and got sued over it - and forced to stop. The reason was - the rigs came with a GVW of 6500 lbs. - and as soon a gear and three adults got in, it was usually over that weight. These setups were called "Blazer Chalets" or "GMC Casa Grandes." I've got several On the GM literature for 1976, they show the front 10 bolt axle with a max. load of 3600 lbs. and the rear 12 bolt axle with 4000 lbs. max. The 12 bolt has the same axles and wheel-bearings as the 10 bolt axle, so I assume 10 bolt axles are also rating 4000 lbs. max for weight load? Axles and weight limits take load and pulling capacity into account. I assume the 12 bolt used in 70s 1/2-tons is rated higher then the 10 bolt because it can pull more, NOT carry more.
I've got to assume the 14 bolt semi-floater is rated up around 5000 lbs. or more, but I've yet to find any specific specs for load capacity.
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